Schematic Diagram

Manual mode buttons:

: B1 - turns output relay 1 on / off ( red VD5-lights ); B2 - turns output relay 2 on / off ( red VD6-lights ); B3 - turns output relay 3 on / off ( red VD7-lights ); B4 - Shift

Automatic mode buttons:

: Shift and B1 - the automatic mode of channel 1 on / off ( yellow VD1-lights ); Shift and B2 - the automatic mode of channel 2 on / off ( yellow VD2-lights ); Shift and B3 - the automatic mode of channel 3 on / off ( yellow VD3-lights )

When the microcontroler works, VD4 always blinks.

Schematic Diagram:

Click to enlarge PIC 16F873A module schematic

fig.1 SerReg

Click to enlarge Power Supply schematic

fig.2 Power Supply

Click to enlarge Analog Input Connections schematic

fig.3 Typical Analog Input Connections

See also:

1.	AN 990	Analog Sensor Conditioning Circuits
2.	AN 679	Temperature Sensing Technologies
3.	AN 929	Temperature Measurement Circuits for Embedded Applications
4.	AN 685	Thermistors in Single Supply Temperature Sensing Circuits
5.	AN 684	Single Supply Temperature Sensing with Thermocouples
6.	AN 844	Simplified Thermocouple Interfaces
7.	TC1047	Precision Temperature to Voltage Converter
8.	LM135	Precision Temperature Sensors
9.	PIC 16F873A	Microchip's 28-pin PICmicro Flash Microcontroller
10.	MAX232	Dual Receiver / Transmitter that converts TTL / CMOS levels to RS232 levels
11.	MAX690	Microprocessor Supervisory Circuit
12.	DS2003	High Current / Voltage Darlington Drivers
13.	7805	Positive Voltage Regulator

Last modified :
09.04.2006